单向带抗剪键叠合板的受力性能试验  

Experimental of loading-bearing capacity of one-way laminated slab with shear keys

作　　者：李明[1] 王浩然[1] 赵唯坚 LI Ming;WANG Hao-ran;ZHAO Wei-jian(School of Civil Engineering,Shenyang Jianzhu University,Shetiyang 110168,China;College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]沈阳建筑大学土木工程学院,沈阳110168 [2]浙江大学建筑工程学院,杭州310058

出　　处：《吉林大学学报（工学版）》2020年第2期654-667,共14页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金面上项目(51278312);辽宁省科学技术计划项目(20180550288);沈阳市科技支撑计划项目(18-013-0-29).

摘　　要：为研究带抗剪键叠合板的受力特性,进行了7块单向板的静力试验,并采用有限元方法补充分析。结果表明:不同形式的抗剪键均能保证叠合板界面连接的可靠性,使其达到与现浇板接近的力学性能;现浇层与预制层混凝土、抗剪键与预制层混凝土结合牢固,整体性好;当跨度小于3.2 m时,两端简支单向带抗剪键叠合板可近似按一次受力构件计算;预制底板和现浇层间采用摩檫接触时,随着抗剪键行数、列数及抗剪键横截面积的增加,叠合板的屈服荷载增加,屈服位移减小,且列数影响更明显,但三者增加到一定程度后,影响不再明显;布置一定数量的抗剪键后,抗剪键混凝土强度等级、现浇层混凝土强度等级及摩擦因数对叠合板的承载力和屈服位移几乎无影响。最后,建立了带抗剪键叠合板的刚度计算式。In order to study the mechanical characteristics of the laminated slab with shear keys,a static test with 7 slabs was carried out and an supplementary analysis was made by finite element method. The results show that different types of shear keys can ensure the reliability of the interface of the laminated slab to enable its mechanical characteristics close to the cast-in-place slab. The concrete is firmly bonded between cast-in-place layer and precast layer,and between shear key and precast layer,which has a good integrity.The simply supported laminated slab with shear keys can be approximately calculated according to the once force bearing component when the span is less than 3.2 m. When the contact between the precast base plate and the cast-in-place layer is made in a friction manner,the yield load of the laminated slab increases and the yield displacement decreases with the increases in the number of rows of shear key,the number of columns of shear key and the cross-sectional area. The number of columns of shear key has a more obvious influence. When the above three factors increase to a certain extent,the influence is no longer obvious.After a certain number of shear keys are arranged,the strength grade of the concrete of shear key,the strength grade of the concrete of cast-in-place layer,and the friction coefficient have little influence on the bearing capacity of the laminated slab and the yield displacement. Finally,the stiffness formula of the laminated slab with shear keys is established.

关 键 词：土木工程 叠合板 抗剪键 力学性能 影响因素 刚度计算式 

分 类 号：TU375.2[建筑科学—结构工程]